上游充通大兽 SHANGHAI JIAO TONG UNIVERSITY 7.Membranes are fluid structures.膜是流动性结构。Lipid molecules diffuse rapidly in the plane of the membrane,as do proteins,unless they are anchored by specific interactions.In contrast,lipid molecules and proteins do not readily rotate across the membrane.Membranes can be regarded as two-dimensional solutions of oriented proteins and lipids.生物膜可以看作是脂质和蛋白质之间有序排列的二维结构。 8.Most cell membranes are electrically polarized,大多数细胞膜两侧电 极化的，such that the inside is negative[typically-60 millivolts(mV)】 Membrane potential plays a key role in transport（运输)，energy conversion(能量转换)，and excitability(神经兴奋).7. Membranes are fluid structures. 膜是流动性结构。Lipid molecules diffuse rapidly in the plane of the membrane, as do proteins, unless they are anchored by specific interactions. In contrast, lipid molecules and proteins do not readily rotate across the membrane. Membranes can be regarded as two-dimensional solutions of oriented proteins and lipids.生物膜可以看作是脂质和蛋白质之间有序排列的二维结构。 8. Most cell membranes are electrically polarized,大多数细胞膜两侧电 极化的，such that the inside is negative [typically - 60 millivolts (mV)]. Membrane potential plays a key role in transport（运输）, energy conversion（能量转换）, and excitability（神经兴奋）